statstics: fix cannot load non-index column with concurrently init stats

[hawkingrei]

What problem does this PR solve?

Issue Number: close #57544

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

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None

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.5@719f68e). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #57548   +/-   ##
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  Coverage               ?   72.1539%           
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  Hits                   ?     297754           
  Misses                 ?      94949           
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Flag	Coverage Δ
unit	72.1539% <100.0000%> (?)

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Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.5554% <0.0000%> (?)